Spring scale



Jan. 12, 17932.

s. G. AVERELL ET AL SPRIANG SCALE Filed June 6, 1929 f a 7 6 Z 2 M 2 w 43 |l J EHJ HHLrlEIIIJ z l ---u z j a J V /J/ Z L 4 J J 5 6 Illlillll .[l f 0 ,7 UQHU f 5 .M .ai :il ,f f d mw y L (PL V J W/V- @M1 i f# I@ 1,., M l. %7 M 5 M 1\ O F 3 :4J

MA TTORNEY Patented Jan. 12, 1932 UNITED STATE-s CRANFORD, NEW JERSEY, ASSIGNORS TO JOHN CHATILLON & SONS,

N. Y., A CORPORATION OF NEW YORK PATENT i OFFICE",

SYLVESTER G. AVERELL, OF NEW YORK, N.`*Y.,` AND ROBRT'BINGHAM WASSON, OF

SPRING SCALE Application mea June e, 1929. serial 110,363,853.

This invention relates to spring scales, and more particularly to a novel construction for correcting the reading of the indicator for the changing length of the wire of the spring andV for the changes in the stiffness of the spring due to changes in temperature. Y

A primary obj ect of the invention is to provide a simple, practical and reliable construction for supporting the main spring or springs ofthe scale upon a. thermostatically controlled supporting spring whereby as the material of the spring lengthens or shortens under varying temperatures, the point of support on the supporting spring will be automatically shifted vertically and horizontally to increase or decrease the active length of the supporting spring to compensate vfor the change in length of the wire of the' springs as well as the change in stiffness ofthe ma-r terial of the springs due to changing temperature conditions. That is to say, the present invention contemplates a novel type of thermostatically V controlled springsuspension which as shown lin drawings consists of a pair of coiled springs supported at the outer ends of fiat supporting springs, supported, guided upon` and movable over inclined supporting surfaces by therinostatic means, and thereby raising ordepressing the coiled springs to correct the' zero reading of the scale and decreasing or increasing the active length of 'supporting fiat springs and thereby compensating for the Variant stiffness of the springs due to temperature changes.

Other objects of the invention will appear as the description proceeds. Y Y

A preferred a.nd"practical embodiment of the invention is shown in the drawings, in which:

Figure 1 is a rear elevation of our improved construction v without the surrounding scale casing. l j l 1 1 Fig. 2 is a side elevation of the construction shown in Figure l. Y

Fig. 3 is a top plan view of the hanger shown in Figs. 1 and Zand illustrating the accompanying corresponding parts throughout the several figures ofthe drawings.

In the embodiment of the invention shown in the drawings, the same includes a frame F having the hangerportion 1 Vat the upper end thereof and offset as indicated at 2 to accommodate the main springs S and their associated mechanism. As usual, the main ysprings S are connectedk at their lower ends with the runner R which carries the pan or` other load supporting element of the scale.

As previously indicated, one'of the'dis-4 OF NEW'YORK', r

suitable links 3 which are carried on the l pivot pins 1 mounted in eyes 5 at the outer ends of the supporting and: compensating springs 6. These springs rest upon the in! clined surfaces 7--a of the locking members 7, which prevent the. springs from sliding down their inclined seats when the scale is under load. Their upper surfaces bear against thefinclined surfaces 8 vof the bracket members 9 pivoted at 10 to the upper end of the frame F at opposite sides of the opening 11 therein. Thebracket member and the Vinclination of the seat may be .regulated by lmeans of the slot 12. bolt 13 and nut 14. The locking members 7 are pivoted to the bracket members 9 at 7 b. The inner ends of the supporting and compensating springs 6 are connected by suitable clamps 15 on the studs 16 which are adjustably secured in the upper ends of the thermostats TT by means of the nuts 17, 18. The thermostats TT are secured in adjusting blocks 19 which are adjustably secured to the frame F by means of the slots 20, bolts 21 and nuts 22., By raising or lowering the adjusting blocks 19 the'active lengt-h of the thermostats TT may be increased or diminished. Thevthermostats TT may be constructed of any suitable metals but inthe embodiment shown preff Thus when the thermostats are subjected to changing temperature conditions the upper ends thereof will be moved toward and from each other and move the supporting springs 6 on the inclined seat-s or surfaces 7-(5, the inward movement elevating the ends and diminishing the active lengths of such springs and the outward movement lowering the supporting ends and increasing their active length and thereby varying` the position of the supporting ends of said springs and their stiffness.

Then the temperature rises the springs are drawn to vard cach other and the rise of the ends of the springs corresponds with the increased length of the main springs and causes the pointer to register with zero and the shortenii'ie` and stiffening` of these springs compensa-.es for the deci-oise in stiffness of the main springs due to increase in temperature. Vlhen the temperature falls, the springs are moved outward and their' ends depressed and flexibility increased. The depression of the ends corresponds with the decrease of length of the main springs and causes the indicator to register with Zero and increased 'tlexiliiility of the su i'iporting springs compensates for the increased stiffness of the main springs causing the indicator to correctly register the weight on the scale under all loads-and temperature changes and likewise to maintain 'the indicator at Zero when the scale is not under load under all changes in temperature. lVhen the spring is under no load, the locking members 7 freely permit the thermostats TT to move the supporting springs 6 `on the inclined seats 7, and When the scale is under load, the locking members 7 tilt slightly and force the springs 6 against the inclined surfaces 8 and prevent them from sliding on their inclined seats.

The runner R has pivotally connected thereto a rack 24 which meshes with the pinion 25 on the indicator shaft 26 on the outer end of which the indicator 2? is mounted. This indicator 27 cooperates with a suitably calibrated dial. 28 in the usual manner. In (':onnection with the raclr Q-t it is pointed out that the saine may be of any suitable material, as previously indicated, since all of the desired corrections and compensations for chang in the spring` material due to cha-nge.l in temperature are taken care of by the novel arrangement of the springs and their support and actuation by the thermostat.

It is apparent that one or any number of load ano supporting springs may be used.

lvithout further description it is thought that the features and advantages of the invention will be readily apparent to those skilled in the art. and .it will of course be understood that changes in the form, proportion and minor details of construction may be resorted y to, Without departing from the spirit of the invention and scope of the appended claims.

l. In ay spring scale the conibiinltion with a main .load responsive spring, of a thermostat and a shiftable support for said spring connected to said thermostat and adapted to compensate for the change in length of the nire ofthe spring and the cha ages in the stift'- ness thereof due to changes in temperature.

2. In a spring scale the combination with a main load responsive spring, of a thermostat and a resilient support for said spring directly connected to said thermostat and adapted to compensate for the change in length of the Wire of the spring and the changes in the stiffness thereof due to changes in temperature.

3. In a spring scale the combination with a main load responsive spring, of a. thermostat, a spring supporting said load responsive spring connected at one end to said thermostat and at its opposite end to said load supporting spring, an inclined seat for said flat spring and means for holding said spring in contactivitli said seat, whereby the movement of the spring over the seat Will compensate for the change in length of the Wire of the spring an d the changes in the stiffness thereof due to changes in temperature.

JL In a spring scale the combina tion with a main load responsive spring` of a thermostatically controlled spring supporting at its outer end said load responsive spring, and a coinbined guiding and supporting seat for said spring. whereby the movement of said spring over said seat Will compensate for the change in length of the Wire of the spring and the changes in the stiffness thereof due to changes in temperature. i

5. In a spring scale the combination with a main load responsive spring. of a thermostatically controlled spring supporting at its outer end said load responsive f-tpring, and a combined guiding and su pporting seat. said seat being inclined from the horizontal and adapted to siu'iport the said 'tl at spring whereby the movement of said spring over said seat will compensate for the change in length of the Wire of the spring and the changes in the stiffness thereof due 'to changes intemporature.

6. In a spring scale the conil'iiuation of a main load responsive spring, of a resilient member operatively connected at one end with said spring. an inclined seat for supporting` said resilient member` and a thermostat connected to the end of said resilient member opposite the connection of the load responsive spring therewith.

7. In a spring scale the combination with a main load responsive spring. of a resilient men'iber, an inclined seat for supporting said resilient n'leinlgier. a link connecting the outer end of said resilient memher with the load lresponsive spring and a thermostat connected with the inner end of said resilient member.

8. In a spring scale the combination of av main load spring, a supporting spring on the free end oi' which the main spring is supported, an inclined seat for said supporting spring, and tlierinostatic means for moving said supporting spring longitudinally on its seat.

9. In a spring scale the combination of a main load spring, a supporting spring on the free `end of which tlie main spring is supported, an inclined seat for said supporting spring, means for guiding and holding the supporting spring on its inclined sea-t, and t-liermostaticmeans for moving said supporting spring longitudinally on its seat.

and means for manually adjusting the position of said supporting spring on its seat.

Si ned at New York city, in the county of N ewgYork and State of New York, this 29th day of May, A. D. 1929.

SYLVESTER G. AVERELL.

ROBERT BINGHAM WASSON.`

10. In a spring scale thecombination of a main load spring, a supporting flat spring on the free end of which the main spring is supported, said supporting spring being supported on an inclined seat, and thermostatic means for moving said supporting spring longitudinally on its seat.

11. In a spring scale the combination of a main load spring, a supporting spring on the free endof which the main spring is supported,y said supporting spring being supported on an inclined seat, and tlie-rmostatic means for moving said supporting spring longitudinally on its seat, the supporting spring, its inclined seat and said thermostatic means cooperating with the main load spring and indicator to compensate for changes of length of the springs and changes in the stillness of the springs due to temperature changes.

12. In a spring scalle the combination of a main load spring, a supporting spring on tlie free end of which the main spring is. supported, said supporting spring being supported on an inclined seat, means for adjusting the inclination of saidseat,V and thermoy static means for moving said supporting spring longitudinally on its seat. Y

13. In a spring scale the combination of a main load spring. a supporting spring on the free end of which the main spring is supported, an inclined seat for said supporting spring, thermostatic means for moving said supporting spring longitudinally on its seat and automatic means for locking said supporting spring against longitudinal movement when the scale is under load.

14. In a spring scale the combination of a main load spring` a supporting spring on the. free end of which the main spring is supported, an inclined seat or said supporting spring, thermostat-1c means for moving said supporting spring longitudinally on its seat and means for regulating the activity of the thermostatic means.

l5. In a spring scale the combination of a main load spring, a supporting spring on the free end of which the main spring is supported, an inclined seat for said supporting spring, thermosta-tic means for moving said supporting spring longitudinally on its seat 

